Everytime I (re)read this one I feel like there's too many feelings and deepness in the storyline. Sincerely, I can feel their chemistry from episode one and every chapter feels like I'm intruding in their relationship, kinda like I shouldn't be reading and invading their privacy
I don't remember any that has both feelings (too deep + intimate) like WOW, but one that I think that gets the closest is Down and Dirty.
And here's a few others that are 'kinda/not really' like that:
1. Here U Are (very pure, very cute and well written)
2. Shangri La no Tori (it gets to you in a different way... A lot of complicated feelings)
3. Our Sunny Days (masterpiece, healing in every chapter )
And if you're also into straight romance, I really like My reason to die, Just twilight and Purple Hyacinth (not really romance... But leaves you on edge for sure + if you read though the Webtoon app you even get BGM, for free )
So I feel like the ex bf just doesn't care enough, doesn't like the FL enough. Sure, he might think like he'll just follow what she wants, and do whatever she thinks is best, but to me it seems more that he saw her as a "sister" or "partner", no feelings involved. So he liked her, but didn't feel love towards her, or passion/attraction. Therefore, for him it's ok to get back together or just continue on their own (and also why he felt 'nothing' when he saw her with the ML)... He seems like a nice guy, I just hope things won't become too messy and dramatic with him and the ML getting too close
Also, WHAT A BITCH!!!! I really hope she gets into a scandal and end her career... How can she be so manipulative and cause so much damage to a pure boy like the ML???!!! (for the first time I'm wishing someone things like this, and now I understand knetz
He has memories and still seems to not acknowledge that she always chose anything (even death) but him ヽ(`Д´)ノ
Just go die and let my babies be happy